Is it essential to teach about Phase Diagrams? Probably not. I do. This slideshow has a video and video worksheet. This CK Chemistry unit has videos and a simulation. I use this worksheet (key) to help kids navigate a phase diagram. Phase diagrams map the equilibrium states for a substance. Stick to the phase diagrams for water and carbon dioxide.
I use this as an opportunity to explain equilibrium. We live outside DC near Quantico. I 95 is in our back yards. I use I 95 to explain equilibria. Monday to Friday, barring a holiday, I 95 North is bumper to bumper at 6 am; I 95 South is a small stream at 6 am. At 6 pm, I 95 North is a small stream and I 95 South is bumper to bumper. At noon, Monday to Friday, the traffic north and south on I 95 is roughly the same. Traffic is in a steady state. When I teach the module on equilibrium at the end of the course, I use the same analogy to show how to calculate the equilibrium constant.
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